transfer specific index of array to a new array - php - php

Question

I want to delete an index from array and insert it into in new array. I want two things which i tried to explain one is
Array
(
[index1] => Deleted
[index4] => Inserted
)
Array
(
[index3] => test
[index4] => Inserted
)
Array
(
[index2] => numbers
[index3] => test
[index4] => Inserted
)
Array
(
[index1] => Deleted
)
now i want if arraysize is 1
foreach($array as $arrays){
array_push($array1,($arrays[0]));
unset ($arrays[0]);
}
i want to remove
Array
(
[index1] => Deleted
)
from $array and $array to be
[index1] => Deleted
second is if $array is
Array
(
[index2_123] => numbers
[index3_level] => test
[index4_test] => Inserted
)
i want a new array with $array1 as
Array
(
[index3_level] => test
)
and $array1 is modified to
Array
(
[index2_123] => numbers
[index4_test] => Inserted
)

Answer 1

Try this way,
$arr = Array
(
'index1' => 'Deleted',
'index2' => 'numbers',
'index3' => 'test',
'index4' => 'Inserted'
);
$arr1 = $arr2 = array();
$i = 0;
foreach($arr as $key => $value){
if($i%2 == 0){
$arr1[$key] = $value;
}else{
$arr2[$key] = $value;
}
$i++;
}
Output
$arr1
Array
(
[index1] => Deleted
[index3] => test
)
$arr2
Array
(
[index2] => numbers
[index4] => Inserted
)
And if you don't need that value then you can use it as
$i = 0;
foreach($arr as $key => $value){
if($i%2 == 0){
$arr[$key] = $value;
}else{
unset($arr[$key]);
}
$i++;
}
print_r($arr);
Output:
Array
(
[index1] => Deleted
[index3] => test
)

Answer 2

Loop through them and generate the array -
$new = array();
foreach($yourarray as $key => $val) {
$index = str_replace('index', '', $key); // get the key index
if($index % 2 != 0) { // check for odd or even
$new[$key] = $val; // set the new array
unset($yourarray[$key]); // delete from the main array
}
}
Update
For any index use a counter
$i = 0;
$new = array();
foreach($yourarray as $key => $val) {
if($i % 2 != 0) { // check for odd or even
$new[$key] = $val; // set the new array
unset($yourarray[$key]); // delete from the main array
}
$i++;
}

Answer 3

You can use a combination of array_flip and array_diff_key to filter the first array, then use array_diff filter the second:
$specificIndex = array('index1', 'index3');
$array1 = array_diff_key($array, array_flip($specificIndex));
$array2 = array_diff($array, $array1);
Demo.
If you want get in an array only certain elements of your choice you can do something like:
$specificIndex = array('index1', 'index3');
$selectedItem = array_intersect_key($array, array_flip($specificIndex));
Demo.

Answer 4

<?php
$array = array(
'index1' => 'Deleted',
'index2' => 'numbers',
'index3' => 'test',
'index4' => 'Inserted',
);
$specificIndex = 'index3';
$array1=array();
foreach($array as $key => $value){
if($key==$specificIndex){
$array1[$key] = $value;
unset($array[$specificIndex]);
}
}
print_r($array);
print_r($array1);
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